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Relocated hypocenters and structural analysis from waveform modeling of aftershocks from the 2011 Prague, Oklahoma, earthquake sequence

Marius P. Isken and Walter D. Mooney
Relocated hypocenters and structural analysis from waveform modeling of aftershocks from the 2011 Prague, Oklahoma, earthquake sequence
Bulletin of the Seismological Society of America (April 2017) 107 (2): 553-562

Abstract

We present an analysis of aftershocks with M (sub L) >3 from the 2011 Prague, Oklahoma, earthquake sequence, an intraplate sequence of moderate-size earthquakes within the North American craton. We apply waveform analysis to seismograms from temporary local seismograph networks to relocate the aftershocks' hypocenters. The relocations show that the hypocenters are confined to the Precambrian basement. The character of the recorded seismograms waveforms are reconstructed by finite-difference forward modeling of seismic sources buried at different depths in 2D crustal models. The numerical modeling indicates that the observed complex waveforms, and particularly the coda, are created by waves scattering off numerous shallow crustal velocity anomalies. We infer that these anomalies correspond to paleoriver channels that are embedded in the Pennsylvanian limestone formation. The modeling indicates that the amount of energy within the coda depends on the depth of the source. Our waveform modeling of the observed seismograms is consistent with our relocations of the aftershocks to depths of 5-10 km, within the Precambrian basement. Electronic Supplement:Empirical and synthetic data, model parameters, and geological figures.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 107
Serial Issue: 2
Title: Relocated hypocenters and structural analysis from waveform modeling of aftershocks from the 2011 Prague, Oklahoma, earthquake sequence
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 553-562
Published: 201704
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 30
Accession Number: 2017-037574
Categories: SeismologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., geol. sketch maps
N35°00'00" - N36°00'00", W98°00'00" - W95°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201721
Program Name: USGSOPNon-USGS publications with USGS authors
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